JPS5836933Y2 - Pump mechanical seal scorching and crystallization prevention device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for preventing scorching and crystallization of a pump mechanical seal.

In general, fluids such as high viscosity fluids or sugar-containing fluids that are pumped can cause scorching or crystallization of the fluid at the mechanical seal of the pump shaft, which increases the load on the pump shaft and causes the motor to trip. As a method, the mechanical seal part is cooled with water.

Therefore, in this project, by using a high-performance heat transfer element on the pump shaft and making it into a heat pipe, the temperature of the shaft and mechanical seal part is made equal to the temperature of the flowing fluid, and the scorching crystals of the fluid can be prevented without using water. It was devised to help save water by eliminating the need for water supply piping and drainage piping in the case of conventional water cooling methods.

That is, the pump shaft is hollow across the mechanical seal part and the column impeller mounting part to form a sealed chamber, and the axial inner wall of the sealed chamber is lined with a wick made of a porous material, and the sealed chamber is operated in a reduced pressure state. It is filled with liquid.

The embodiments shown in the drawings will be described below.

First, to explain the principle of a heat pump, as shown in Figure 1, a sealed metal tube 1 is lined with a wick (porous material) 2 made of a substance that causes capillary action in a cylindrical shape. Furthermore, after reducing the pressure inside the tube, a working fluid (heating medium) such as ethanol is sealed.

Therefore, when one end a is heated, the working fluid instantaneously evaporates, carries heat to the other end as shown by the arrow in the figure, radiates heat, liquefies again, and returns to the heating part due to the capillary action of the wick, where it evaporates again. This process is automatically and continuously repeated to perform heat exchange.

In the present invention, a heat pipe as described above is attached to the pump shaft so that the temperature of the shaft and the mechanical seal portion becomes equal to the temperature of the flowing fluid.

In other words, the shaft of the motor 4 on the motor base 3 is directly connected to a pump shaft 5, which is inserted through a bank plate 6 and has an impeller 8 mounted inside a pump case 7.

The mechanical seal part A of the pump shaft is as follows.

That is, the presser foot 1 of the seat ring 9 is attached to the bank plate 6.
0, and a seal ring 11 in contact with this seat ring 9 is pressed by a spring 12.

13 is a sleeve constituting a stop for the spring 12.

Others 14.15 are O-rings.

In this case, the pump shaft 5 is made hollow over the mechanical seal part or the line propeller attachment part to form a sealed chamber 16, and a wick 17 made of a porous material is provided on the inner wall in the axial direction.
The inside of the chamber is lined with water, and the pressure inside the sealed chamber is reduced and hydraulic fluid is sealed inside the chamber.

In this case, the pump shaft is made into a heat pipe as described above, so the heat generated at the mechanical seal part is transmitted to the impeller mounting part and released to the outside, so the temperature of the shaft and mechanical seal part is equal to the temperature of the flowing fluid. They became equal and the scorching crystallization of the fluid disappeared.

In any case, in this case, the impeller functions to flow the fluid and also dissipates the heat of the mechanical seal, so there is no need for water supply piping and drainage piping as in the case of water cooling, which greatly reduces water consumption. It has the characteristic of being useful.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the principle of a heat pipe, FIG. 2 is a partially cutaway front view of the sanitary pump, FIG. 3 is a side view of the same, and FIG. 4 is an enlarged view of the shaft. 5... Pump shaft, 6... Back plate, 7... Pump case, 8... Impeller, A... Mechanical seal part, 16...
...Sealed room, 17...Wick.

Claims (1)

[Scope of utility model registration request] The pump shaft is hollow from the mechanical seal part to the impeller mounting part to form a sealed chamber, and the axial inner wall of the sealed chamber is lined with a wick made of a porous material, and the sealed chamber is depressurized to supply the working fluid. A device to prevent scorching and crystallization of pump mechanical seals.